Ball-point pen
a ball-point pen and pen body technology, applied in the field of ball-point pen, can solve the problems of insufficient ink supply to the writing ball side, damage to the appearance of the writing ball, poor rigidity of the tip end to which writing pressure is applied, etc., and achieve the effect of inhibiting the joint member from deformation and reducing the degree of damage to the writing tip
Inactive Publication Date: 2007-08-09
MITSUBISHI PENCIL CO LTD
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Benefits of technology
[0023] Thus, since it is arranged in dimensions that the part of the above-mentioned cover member does not approach within 0.2 mm of the writing tip in the relative movement range of the cover member after starting to fit the cover member to the joint member until completion of the mounting, it is possible to further reduce a degree of damage to the writing tip by means of the above-mentioned cover member.
Problems solved by technology
As described above, when the writing tip is reduced in diameter, a problem arises in that its tip end to which writing pressure is applied has poor rigidity, and that as the tip is reduced in diameter, its inner diameter i.e., an ink passage is also reduced in diameter so that an insufficient amount of ink is supplied to the writing ball side at the top end.
Therefore, a joint member into which the writing tip is press-fitted and which is made of a less glittering synthetic resin is extended to the vicinity of the top end of the writing tip, leading to a secondary problem of damaging its appearance.
Method used
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[0038] Hereafter, a ball-point pen in accordance with the present invention will be described with reference to preferred embodiments as shown in the drawings. Firstly, FIG. 1 shows the whole structure of a refill which constitutes the ball-point pen in accordance with the present invention. In other words, the ball-point pen is formed by accommodating this refill as shown in FIG. 1 in a well-known body cylinder (not shown). In addition, in the structure of the refill as shown in FIG. 1 and each drawing to be explained hereafter, like parts equivalent to those shown in FIGS. 12 and 13 as already explained are denoted with like reference signs. Accordingly, the description of these will not be repeated.
[0039] Firstly, in the structure of the refill as shown in FIG. 1, reference signs 1, 3, 4, 5, and 6 respectively indicate, as already described, a writing tip, a first joint member, a second joint member, a ball valve, and a cover member. It is arranged that a rear end portion of the...
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A ball-point pen, wherein a cover member (6) is fitted to a joint member (3) connecting a writing tip (1) rotatably supporting a writing ball (2) at the tip thereof to an ink storage tube. When the cover member (6) is fitted to the joint member (3) along the outer peripheral surface thereof, a part of the cover member does not come within 0.2 mm (within the range of the chain double-dashed line) from around the writing tip. Thus, even if the accuracies of parts and assembly machines are dispersed, a problem with an existing ball-point pen wherein a cover member is brought into contact with a writing tip and the writing tip is damaged in an assembly step can be avoided.
Description
TECHNICAL FIELD [0001] The present invention relates a ball-point pen using a refill provided with a writing tip at a top end of which a writing ball is rotatably supported, an ink storage tube inside of which ink is stored, and a joint member for connecting the above-mentioned writing tip and ink storage tube and supplying the ink in the ink storage tube to the above-mentioned writing tip side. BACKGROUND ART [0002] Conventionally, some ball-point pens especially designed for fine writing are provided in which their writing tips are reduced in diameter. There is a purpose of reducing an area as much as possible in which the writing tip may hide written lines in the case of writing and drawing small and fine letters and figures. The thus diameter-reduced writing tips are accepted in the market, which are made from a pipe-like material by way of plasticity processing or cutting, or formed from a cylindrical material by cutting, for example. [0003] As described above, when the writing...
Claims
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Login to View More IPC IPC(8): B43K7/00B43K7/10B43K1/08
CPCB43K1/08B43K7/10B43K7/00
Inventor HIRANO, KOICHI
Owner MITSUBISHI PENCIL CO LTD